X-ray absorption branching ratio in actinides: LDA+DMFT approach

To investigate the x-ray absorption (XAS) branching ratio from the core 4d to valence 5f states, we set up a theoretical framework by using a combination of density functional theory in the local density approximation and Dynamical Mean Field Theory (LDA+DMFT), and apply it to several actinides. The results of the LDA+DMFT reduces to the band limit for itinerant systems and to the atomic limit for localized f electrons, meaning a spectrum of 5f itinerancy can be investigated. Our results provides a consistent and unified view of the XAS branching ratio for all elemental actinides, and is in good overall agreement with experiments.Comment: 6 pages, 4 figure

Nitrate removal using Purolite A520E ion exchange resin: batch and fixed-bed column adsorption modelling

© 2014, Islamic Azad University (IAU). Removing excessive nitrate from water is essential because it causes eutrophication which in turn has a harmful effect on aquatic life, resulting in a reduction in biodiversity and posing a danger to people’s health when the water is used for drinking. In this study, nitrate removal from aqueous solutions was studied using an ion exchange resin (Purolite A520E) in batch and fixed-bed column experiments. Batch adsorption kinetics was very well described by pseudo-first-order, pseudo-second-order and homogeneous surface diffusion models for resin doses 1.5 and 3.0 g/L at a nitrate concentration 20 mg N/L. Column kinetic data satisfactorily fitted to the empirical Thomas model and a numerical model based on advection–dispersion equation for filtration velocities 2.5 and 5.0 m/h at a column height of 12 cm and inlet concentration 20 mg N/L. The experimental and Thomas model predicted breakthrough adsorption capacity ranges for the two filtration rates were 12.0–13.5 and 8.2–9.7 mg N/g, respectively, whereas the maximum adsorption capacity determined using Langmuir adsorption isotherm model in the batch study was 32.2 mg N/g

Does Trust Reduce Concern for Information Privacy in E-Commerce?

Internet commerce continues to grow rapidly and is expected to exceed $5 trillion in 2005. Nevertheless concern for information privacy has been identified as a major consideration constraining many from internet consumerism. Trust has also been identified as an antecedent to willingness/intent to transact, buy or purchase. This research seeks to specify and support a model that involves additional constructs such as familiarity, risk, quality of website, gender, peresonal innovativeness, discretionary income, age, and other factors in order to identify what factors and/or interactions are significant in determining whether a prospect intends to part with funds and become a customer. Data to be gathered with online survey and analyzed using regression

Factorization in graviton interactions

The study of factorization in the linearized gravity is extended to the graviton scattering processes with a massive scalar particle, with a massless vector boson and also with a graviton. Every transition amplitude is shown to be completely factorized and the physical implications of their common factors are discussed.Comment: 5 pages, Revtex 3.0, SNUTP 93-7

AKARI observation of early-type galaxies in Abell 2218

We describe the AKARI InfraRed Camera (IRC) imaging observation of early-type galaxies (ETGs) in A2218 at z ≅ 0.175. With the imaging capability at 11 and 15 μm, we investigate mid-infrared (MIR) properties of ETGs in the cluster environment. Among our flux-limited sample of 22 optical red sequence ETGs, we find that more than 50% have MIR-excess emission, and the most likely cause of the MIR excess is the circumstellar dust emission from asymptotic giant branch (AGB) stars. The MIR-excess galaxies reveal a wide spread in N3-S11 (3 and 11 μm) colors, indicative of a significant spread (2–11 Gyr) in the mean ages of stellar populations. They are also preferentially located in the outer region, suggesting the environment dependence of MIR-excess ETGs over an area out to a half virial radius

The prevalence of fibromyalgia in axial spondyloarthritis

Open access via Springer Compact Agreement ACKNOWLEDGEMENTS SIRAS was funded by unrestricted educational grants from AbbVie and Pfzer. BM was funded by the Ministry of Health, Sri Lanka. We thank all the clinicians and research nurses who facilitated recruitment and data collection to the SIRAS study. We are indebted to the SIRAS steering committee, especially Professor Roger Sturrock (chair) and Dr David Marshall (vice-chair). We also thank staf from the SIRAS coordinating centre, in particular: Elizabeth Ferguson-Jones, Giles O’Donovan, Nabi Moaven-Hashemi and Flora Joyce. We would also like to acknowledge the Post Graduate Institute of Medicine, Sri LankaPeer reviewedPublisher PD

Impact of biological therapy on work outcomes in patients with axial spondyloarthritis : results from the British Society for Rheumatology Biologics Register (BSRBR-AS) and meta-analysis

Funding The BSRBR-AS is funded by the British Society for Rheumatology who have received funding for this from Pfizer, AbbVie and UCB. These companies receive advance copies of manuscripts for comments. This work was conducted within the Arthritis Research UK/Medical Research Council Centre for Musculoskeletal Work and Health (Grant No: 20665) Acknowledgements We are grateful to the staff of the British Society for Rheumatology Biologics Register in Axial Spondyloarthritis register who are currently Claudia Zabke, Maureen Heddle, Nafeesa Nazlee and Barry Morris, and to the recruiting staff at the clinical centres, details of which are available at: https://www.abdn.ac.uk/iahs/research/epidemiology/spondyloarthritis.php#panel1011. We would like to thank Dr Atul Deodhar, Benjamin Hsu and Chenglong Han for providing additional data relating to one of the studies, to allow it be included in the meta-analysis.Peer reviewedPublisher PD

Decoherence window and electron-nuclear cross-relaxation in the molecular magnet V 15

Rabi oscillations in the V_15 Single Molecule Magnet (SMM) embedded in the surfactant DODA have been studied at different microwave powers. An intense damping peak is observed when the Rabi frequency Omega_R falls in the vicinity of the Larmor frequency of protons w_N, while the damping time t_R of oscillations reaches values 10 times shorter than the phase coherence time t_2 measured at the same temperature. The experiments are interpreted by the N-spin model showing that t_R is directly associated with the decoherence via electronic/nuclear spin cross-relaxation in the rotating reference frame. It is shown that this decoherence is accompanied with energy dissipation in the range of the Rabi frequencies w_N - sigma_e < Omega_R < w_N, where sigma_e is the mean super-hyperfine field (in frequency units) induced by protons at SMMs. Weaker damping without dissipation takes place outside this dissipation window. Simple local field estimations suggest that this rapid cross-relaxation in resonant microwave field observed for the first time in SMMV_15 should take place in other SMMs like Fe_8 and Mn_12 containing protons, too